鸸鹋是澳大利亚特有的鸟类，它们不能飞行但跑得很快。

The ___emu is a unique bird to Australia; it cannot fly but can run very fast.

这个实验报告中磁场强度是用电磁单位emu表示的。

The magnetic field intensity in this experiment was recorded in ___emu.